Manufacturers mark

[ROBBYBOBBY64]

I like to figure out which glass manufacturer made what items I find, even if I don't keep them. If I can't I usually bring it home to be identified. I have this jar, it has an M in a circle. It is not like the one in Glassbottlemarks.com. What do you think? Foreign?
ROBBYBOBBY64.

 

[nhpharm]

I'm not sure what the other marks are for, but the key mark on this is the UGB mark, which is for United Glass Bottle. Big British company and you see their mark on many earlier British machine-made bottles.

 

[ROBBYBOBBY64]

I'm not sure what the other marks are for, but the key mark on this is the UGB mark, which is for United Glass Bottle. Big British company and you see their mark on many earlier British machine-made bottles.

Thanks again npharnm.
ROBBYBOBBY64.